All Calculators
Loan & EMI Calculator
Monthly payment, total interest and total repayment for any loan.
OpenDiscount Calculator
Final price, what you save, and what stacked discounts really come to.
OpenPercentage Calculator
Four common percentage problems, solved instantly.
OpenAge Calculator
Exact age in years, months and days, with a next-birthday countdown.
OpenDate Difference Calculator
The span between any two dates, including working days.
OpenUnit Converter
Length, weight, volume, speed, storage and four more.
OpenAbout these tools
Six calculators for the sums that come up often enough to be annoying but not often enough to memorise. Each one updates as you type and explains the formula it used, so you can check the answer rather than just trust it.
Nothing here needs an account, and nothing you put into any of them is uploaded or stored. Every tool is a single page that does one job, so you can bookmark the one you use and skip this page entirely next time.